Vsnprintf (9) Linux Manual Page

vsnprintf – Format a string and place it in a buffer

Synopsis

int vsnprintf(char *buf, size_t size, const char *fmt, va_list args);

buf

The buffer to place the result into

size

The size of the buffer, including the trailing null space

fmt

The format string to use

args

Arguments for the format string

This function generally follows C99 vsnprintf, but has some extensions and a few limitations:

n is unsupported p* is handled by pointer

See pointer or Documentation/printk-formats.txt for more extensive description.

** Please update the documentation in both places when making changes **

The return value is the number of characters which would be generated for the given input, excluding the trailing ‘